Paper/nms-patches/ContainerSmithing.patch

--- a/net/minecraft/server/ContainerSmithing.java
+++ b/net/minecraft/server/ContainerSmithing.java
@@ -3,12 +3,17 @@
 import java.util.List;
 import javax.annotation.Nullable;
 
+import org.bukkit.craftbukkit.inventory.CraftInventoryView; // CraftBukkit
+
 public class ContainerSmithing extends ContainerAnvilAbstract {
 
     private final World g;
     @Nullable
     private RecipeSmithing h;
     private final List<RecipeSmithing> i;
+    // CraftBukkit start
+    private CraftInventoryView bukkitEntity;
+    // CraftBukkit end
 
     public ContainerSmithing(int i, PlayerInventory playerinventory) {
         this(i, playerinventory, ContainerAccess.a);
@@ -54,13 +59,13 @@
         List<RecipeSmithing> list = this.g.getCraftingManager().b(Recipes.SMITHING, this.repairInventory, this.g);
 
         if (list.isEmpty()) {
-            this.resultInventory.setItem(0, ItemStack.b);
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareSmithingEvent(getBukkitView(), ItemStack.b); // CraftBukkit
         } else {
             this.h = (RecipeSmithing) list.get(0);
             ItemStack itemstack = this.h.a(this.repairInventory);
 
             this.resultInventory.a((IRecipe) this.h);
-            this.resultInventory.setItem(0, itemstack);
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareSmithingEvent(getBukkitView(), itemstack); // CraftBukkit
         }
 
     }
@@ -76,4 +81,18 @@
     public boolean a(ItemStack itemstack, Slot slot) {
         return slot.inventory != this.resultInventory && super.a(itemstack, slot);
     }
+
+    // CraftBukkit start
+    @Override
+    public CraftInventoryView getBukkitView() {
+        if (bukkitEntity != null) {
+            return bukkitEntity;
+        }
+
+        org.bukkit.craftbukkit.inventory.CraftInventory inventory = new org.bukkit.craftbukkit.inventory.CraftInventorySmithing(
+                this.repairInventory, this.resultInventory);
+        bukkitEntity = new CraftInventoryView(this.player.getBukkitEntity(), inventory, this);
+        return bukkitEntity;
+    }
+    // CraftBukkit end
 }